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Bok Choy

My Bok Choy bolted big time. What part can I still use? The little leaves on the flowering stem has the flavor in them. I have lots of big leaves but none of the plants looks like the nice baby bok choy that you find in the supermarket.
I was thinking that I might be able to cook all leaves and stems like spinach or cabbage....can I?
If you can open the photo, you will find the Bok Choy in the back raised bed with lots of yellow flowers!